regex

Returns a string which is the subset of haystack that matches the regular expression pattern.

If no matches to pattern are present in haystack, returns an empty string.

If pattern is empty or is an invalid regular expression, throws an exception.

Usage

{{regex haystack pattern flags="t"}}

Arguments

haystack
The input string.

pattern
A valid regular expression.

flags

• r: return the last match to pattern and instead of the first match
• t: trim the final result prior to returning (remove all whitespace from beginning and end)

Examples

Return the first match to pattern (assuming email.body contains "This is red and that is blue and that is green.")

{{regex email.body '/ is [^r]/' flags='t'}}

 is b